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    <title>Peer connection: audio only</title>

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    <h1><a href="../../../../index.html" title="WebRTC samples homepage">WebRTC samples</a> <span>Peer connection: audio only</span>
    </h1>

    <div id="audio">
        <div>
            <div class="label">Local audio:</div>
            <audio id="audio1" autoplay controls muted></audio>
        </div>
        <div>
            <div class="label">Remote audio:</div>
            <audio id="audio2" autoplay controls></audio>
        </div>
    </div>

    <div id="buttons">
        <select id="codec">
            <!-- Codec values are matched with how they appear in the SDP.
            For instance, opus matches opus/48000/2 in Chrome, and ISAC/16000
            matches 16K iSAC (but not 32K iSAC). -->
            <option value="opus">Opus</option>
            <option value="ISAC">iSAC 16K</option>
            <option value="G722">G722</option>
            <option value="PCMU">PCMU</option>
            <option value="red">RED</option>
        </select>
        <select id="codecPreferences" disabled>
            <option selected value="">Default</option>
        </select>
        <button id="callButton">Call</button>
        <button id="hangupButton">Hang Up</button>
    </div>
    <div class="graph-container" id="bitrateGraph">
        <div>Bitrate</div>
        <canvas id="bitrateCanvas"></canvas>
    </div>
    <div class="graph-container" id="packetGraph">
        <div>Packets sent per second</div>
        <canvas id="packetCanvas"></canvas>
    </div>
    <div class="graph-container" id="audioLevelGraph">
        <div>average audio level ([0..1])</div>
        <canvas id="audioLevelCanvas"></canvas>
    </div>

    <a href="https://github.com/webrtc/samples/tree/gh-pages/src/content/peerconnection/audio"
       title="View source for this page on GitHub" id="viewSource">View source on GitHub</a>
</div>
<table>
    <caption>Bitrate and Packes sent per second - approximate results in browsers</caption>
    <tr>
        <th>Opus</th>
        <th>iSAC 16K</th>
        <th>G722</th>
        <th>PCMU</th>
        <th>Browsers Tested</th>
    </tr>
    <tr>
        <td>~40 kbps / Muted : Same, ~50 Packets, Muted : Same or slight drop</td>
        <td>~30 kbps / Muted : Same, ~33 Packets, Muted : Same or slight drop</td>
        <td>~70 kbps / Muted : Same, ~50 Packets, Muted : Same</td>
        <td>~70 kbps / Muted : Same, ~55 Packets, Muted : Same</td>
        <td>Tested in Chrome, Not tested in Opera, Firefox, Safari, Edge</td>
    </tr>
</table>
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